added git workflow to deploy backend, and docker for backend

Dockerfile

@@ -0,0 +1,18 @@
+FROM python:3.10-slim
+
+# Working dir inside the container.
+WORKDIR /app
+
+# Copies req.txt from local machine into /app inside container.
+COPY requirements.txt .
+
+RUN pip install -r requirements.txt
+
+# Copy the rest of files into /app folder.
+COPY . .
+
+# As HF want for backend.
+EXPOSE 7860
+
+# Starting the server.  0.0.0.0 accepts connections from anywhere, not just local. 
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]

main.py

@@ -11,7 +11,6 @@ from backend.api.routers import health
 from contextlib import asynccontextmanager
 from infra.logger_structlog import StructLogger
 import asyncio
-from huggingface_hub import hf_hub_download
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):